Riffle board



J. HORN.

. RIFFLE BOARD.

I I APPLICATION FILED SEPT. 23, 1920. v v 1,419,052. PatentedJune 6,1922.

F/6.2. -F & 2

1 l 11 i i INVENTOR a TTO NEYS.

JOE HORN, 01 EUREKA, UTAH.

RIFFLE BOARD.

Application filed September 23, 1920.

To all whom it may concern:

Be it known that 1, Jon HORN, a citizen of the United States, residing at Eureka, in the county of J nab and State of Utah, have invented new and useful Improvements in RitHe Boards, of which the following is a specification.

This invention relates to riffle boards for ore concentrating tables, and has for its object the provision of novel means for mounting the ritiies of such a board with relation to a wooden base provided for the same.

The invention will be readily understood from the following description of the accompanying drawings, in which Figure 1 is a perspective View of a riflle board constructed in accordance with the invention.

Fig. 2 is a transverse section on the line 22 of Fig. 1.

Fig. 3 is an enlarged fragmentary transverse section.

Fig. 4 is a fragmentary perspective detail of the board.

Fig. 5 is a perspective view of one of the tightening clips.

In the drawings the deck of the concentrating table is shown as formed of the board 1. A layer of tar paper 2 is placed upon the upper face of the board 1 and then wooden spacer strips 3 and riiiles a are alternately laid upon the tar paper covering of board 1. The strips3 are, preferably, about an inch wide and three-eighths of an inch thick. The riflles at may be either of metal or hard rubber, the latter being preferred in certain classes of work where the acid of the pulp treated upon the concentrating table tends to destroy metallic riflies. The riflies are held in upright position by means of the spacer strips at the opposite sides thereof, said strips being nailed through the tar paper covering to the board 1 by nails 5, preferably, placed along the strips approximately every six inches.

If from warpage or any other cause the Specification of Letters Patent.

Patented June 6, 1922.

Serial No. 412,152.

riflles should become loose between the spacer strips, they may be tightened by the use of suitable clips 6. These clips are, preferably, of metal and about three-eighths of an inch square and are adapted to be driven into any space formed between a riflie and a spacer strip for firmly wedging the riiile in position.

A little board as thus constructed is cheaply and easily made and readily assembled, the wooden surface presented by the spacer strips having been found by actual test to form as eflicient a base as a base of linoleum or the like, and the riftles being held in position by means of the spacer strips in conjunction with the tightening clips 6 forming a rigid construction wherein the ri'l'lles are not liable to come loose when subject to ordinary use.

Various changes may be made without departing from the spirit of the invention as claimed.

What is claimed is:

1. A riflie board comprising a wooden deck, a tar paper covering upon said deck, ritlle plates upon said covering spaced apart and retained in position by means of spacer strips extending the length of said riflie plate to form. a base, said spacer strips being nailed through the tar paper covering to the wooden deck, and tightening clips inserted between said ritlie plates and said spacer strips.

2. A riiile board comprising a deck, a section of relatively thin waterproof material covering said deck, rifl'le plates positioned upon said covering, spacer strips arranged on said covering between the lower portions of said ritlie plates, fastening means passing through said spacer strips and said covering, and tightening means positioned be tween said rilfie plates and said spacer 

